Excuse me, what is funny, humorous and grotesque humor?

Funny and grotesque are not humor, but humor and humor are synonyms.

What's so funny? Funny description is a clown, which is equal to the role being laughed at, which is essentially different from humor.

And grotesque is not. If there is anything between funny and humorous, grotesque has nothing to do with it. Just look it up. It can only be said that you are well-informed, but you can use some grotesque to achieve humorous effect.